Defence Research and Development Canada (DRDC) Toronto contracted Humansystems Incorporated® (Humansystems®; HSIâ) to conduct a hierarchical goal analysis and construct a human performance model of pilot activities associated with the Sea King helicopter. In particular, DRDC Toronto wanted the human performance model to include activities surrounding Helicopter Deck Landing (HDL) aboard a Navy ship. Ultimately, this model would be used to control a simulated Sea King helicopter. The human performance modelling application used for this project was the Integrated Performance Modelling Environment (IPME).